Figure 1

Holographic metalens designs based on BSR and SSR.

(a,b) Schematic views of the calculation based on the 2D Huygens-Fresnel principle. The geometric parameters are: l = 120 μm, w = 10 μm, a = 45 μm, g = 10 μm. (c) Schematic view of the metalens design based on holographic principles; the center of the blue circles is F (2500, 0), and the center of the red circles is F’ (0, −2500). (d–f) Simulated results of the intensity profiles (|E_Z|²) at 0.75 THz obtained at 50 μm above the metalens. The inset in the top left corner of each figure schematically shows the shape of the unit element, and the incident polarization is indicated by the corresponding white arrow, similarly hereinafter. (h–g) Experimental results of the intensity profiles corresponding to (d–f), respectively. The microscopic images of part of the fabricated metalenses are shown as insets.